Edwin a



E. A. WOOD.

Steam Pressure Gage. No. 45.786. 7 Patented Jan. '3, 1865.

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UNITED STATES PATENT OFFICE.

EDWIN A. WOOD, OF UTIGA, NEWV YORK.

STEAM-PRESSURE GAGE.

Specification forming part of Letters Patent No. 45,786, dated January3, 1865.

To all whom it may concern:

Be it known that I, EDWIN A. W001), of the city of Utica, county ofOneida, and State of New York, have invented a new and usefulImprovement in Springs for Steam-Pressure Gages,of which the followingis a specification.

The nature of my invention consists in so forming and arranging theparts of the spring that they may be put together readily and cheaply,and that when in use there shall be no strain upon the joints to causethem to work loose; and I do hereby declare that the following is a fulland exact description ofmy invention, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,in which v Figure 1 is a perspective view of the under side ot thespring with the stem attached, and Fig. 2 a sectional View of thespring.

A is the upper disk; B, the lower one; 0, the flanges therein; D, thesurrounding ring; E, the bead therein; F, the edge of the ring D turnedover the flanges (1. G is the stem, and H the bent lover.

The disks A and B are concentrically corrugated, alike in size and form,with flanges turned up on the periphery, and are swaged from sheetbrassor other suitable material. The flanges or edges are turned up at rightangles, and are of about a sixth of an inch in depth. The ring D is ofproper-size to fit the vdisks, and is made of sheet-brass or othersuitable metal, andis soldered or brazed, and may have a bead, E, sunkaround its periphery, to give elasticity to it, and serves as a hearingor support to the disks. The stem. G is for con necting the spring withthe steam-pipe, and is attached securely and steam-tight to one of thedisks, and the two are slipped into the ring I)one on each side of thebead Ewith their flanges turned outward, and the edges of the ring arethen turned down with a burnisher or other proper tool to a close joint,which is made steam-tight with soft solder or by other suitable means.The bent lever H, which gives motion to the index, rests with its shortend on the upper surface of the upper disk.

The advantages of this improved method of making these springs are, theready and cheap mannerin which theymay be made, the greater elasticitywhich is given to them, and the almost impossibility of the joints everworking loose.

Instead of using the ring D, one of the disks may be of larger size andhave a deeper flange,

and the smaller disk may be placed inside of the larger one, bothflanges being in the same direction, when the larger flange may beEDVVlN A. WOOD.

Witnesses:

A. DAGWELL, JAMES F. MANN.

